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Volume 111
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Experimental investigation of thermal radiation propagation in bulks of varying porosity (Open Access)
Matthias Tyslik *, Martin Schiemann
Institute of Energy Plant Technology, Ruhr-University Bochum, 44780, Bochum, Germany
10.1016/j.partic.2026.02.015
Volume 111, April 2026, Pages 264-273
Received 29 October 2025, Revised 6 February 2026, Accepted 25 February 2026, Available online 6 March 2026, Version of Record 13 March 2026.
E-mail: tyslik@leat.rub.de
Highlights

• Experimental investigation of bulk porosity effects on thermal radiation transport.

• Infrared and UV techniques visualize radiation fields within the particle bulk.

• A simplified view factor is used to quantify bulk porosity effects on radiative transport.

• Obtained experimental data serve as validation basis for numerical radiation models.


Abstract

Radiative heat transfer plays a central role in many technical systems, amongst others in the processing and thermal treatment of particle bulks. For a detailed understanding of radiation phenomena in these applications and to build a basic data set for radiation model development, an experimental setup has been adapted to investigate radiative heat transfer in simplified packed beds. Hollow stainless-steel rods of different diameters represent 2D particle assemblies with varying bulk porosities. Thermal radiation is captured using an infrared camera and a Fourier Transform Infrared Spectrometer, with temperature fields validated via thermocouples embedded in the steel rods. UV sensitive foils additionally enable direct visualization of radiative transport within the rod arrangement. The results reveal a significant overlap between intrinsic thermal emission and reflected radiation, especially for highly reflective surfaces like stainless steel. Measurements with UV-sensitive foil help to separate reflections from thermal self-emittance. Furthermore, a clear correlation is observed between bulk porosity and the transported thermal radiation. These results underline the dependence of radiation transport on geometric parameters such as the particle diameter and bulk porosity. The experimental data therefore provides a detailed validation basis for numerical radiation transport models.

Graphical abstract
Keywords
Thermal radiation; Spectral reflections; Fourier-transform infrared spectroscopy; View factor
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